IBM N series Hardware Manual page 180

Creating RAID-DP aggregates and traditional volumes
To create an aggregate or traditional volume with RAID-DP–based RAID groups, select that
option in FilerView when storage is provisioned. You can also add the –t raid_dp switch to
the traditional aggr or vol create command on the command-line interface (CLI). The CLI
syntax is [vol | aggr] create name –t raid_dp X, with X representing the number of disks
the traditional volume or aggregate contains. If the type of RAID group is not specified, Data
ONTAP automatically uses the default RAID group type. The default RAID group type that is
used, either RAID-DP or RAID4, depends on the platform and disk that are used.
The output that is shown in Figure 10-19 from the vol status command shows a four-disk
RAID-DP RAID group for a traditional volume named test. The second parity disk for diagonal
dparity
parity is denoted as .
Figure 10-19 Volume status command output of aggregate
Converting existing aggregates and traditional volumes to RAID-DP
Existing aggregates and traditional volumes can be easily converted to RAID-DP by using the
[aggr | vol] options name raidtype raid_dp command. Figure 10-20 shows the example
itso volume as a traditional RAID4 volume.
Figure 10-20 The vol status command showing itso volume as traditional RAID4 volume
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IBM System Storage N series Hardware Guide